Many different things can cause Migraines, they're known as "triggers".....here are a few from a list my ex-wife had, she would get them so bad that she had to be in total darkness for usually 2 days....
Your diet can trigger migraines
Coffee, tea, cola
Monosodium Glutamate (MSG)
Nitrates (food preservatives)
Fatigue or irregular sleep
Changes in weather
Traveling to different altitudes
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